Helps students to understand large numbers by recognizing the three possible digits in each period and then saying that period's name. The charts make reading large numbers easier since the place values are indicated by numbers rather than the word name. Each of the five period charts (billions, millions, thousands, units, decimals) is 12" x 36" for wall display. Can be mounted next to each other to create large numbers. Includes 80, 4" x 6" numeral cards and suggestions that actively engage children to explore specific Common Core State Standards for understanding place value.